318 Port match heads to Performer RPM Intake
They dont fit 1.50 on both.
360 is 1.60,318 is 1.50
I've read this 3 or 4 times and its wrong.
I dont think we want people running around asking for 1.50 exh valves in there 360 heads.
Well ...... the valve rule was 1.88/1.50....... so that’s how the heads were set up.
302’s don’t come with 1.88 intake valves either....... yet that’s what I put in them.
I’m sure you could figure out how to get a 1.50 ex valve in a 360 head.
I dont think we want people running around asking for 1.50 exh valves in there 360 heads.
No one is claiming this is any sort of speed secret.
The heads were set up this way to fit within a specific set of rules, and to see which head combination made more power, within those rules.
318 heads with 1.88 intake valves, or 360 heads with 1.50 exhaust valves........ with the heads being the only thing changed.
The test was done on the dyno, back to back, on the same day.
With the heads in those configurations...... the 360 heads crushed the 318 heads....... on that motor.
There would have probably been an even greater power discrepancy if the 360 heads had used the 1.60 ex valves.